Why? Because when combined with Termux (since the smartphone runs Android 5.1) it gives me the ability to install pretty much all working environment I got used to (NodeJS, gcc, git, SSH, Nano, Python, wget etc) and use all screen space wisely without virtual keyboard. In fact, I'm typing this way right now.
If only I had a Miracast dongle... that would convert the smartphone into a full-featured Linux box with a nice screen resolution.
Do you use this Android functionality to convert your own OTG-enabled devices from content consumption to content production?